Stop lugging your AC adapter and power cord back and forth from home to the office or likewise…. Get a second AC adapter for your Latitude or Inspiron Notebook and keep one at each place. The AC adapter enables you to operate your system or charge the battery from electrical power outlets. If you are running your computer on AC power with a battery installed, the AC adapter charges the battery (if needed) and then maintains the battery's charge. When the system is off, the AC adapter will as well charge the battery and then maintain the battery's charge.